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From | Bart van Rijsbergen <bartvanrijsbergen@student.ru.nl> |
To | statalist@hsphsun2.harvard.edu |
Subject | Re: st: checking model fit with svy estimation on |
Date | Fri, 18 Feb 2011 10:19:04 +0100 |
This article in the stata journal might be helpfull; http://www.stata-journal.com/abstracts/st0099.pdf 2011/2/18 Cheney <furber.cini@gmail.com> > > Hi, > I am having some troubles checking if my model is good (goodness of fit, no > influential outliers etc) and comparing model 1 to model 2 (with other iv's > or w iv's expanded), because of the limitations in stata for post est with > svy... > (eg. svy: logistic outcome iv1 iv2 iv3 iv4 iv5 iv1*iv3) My outcome is > binary and my IV's vary between categorical and binary (gender). I also know > you can test the model to see if you should have the iv's expanded into > dummy variables, I think you run one model, then another (with vars > expanded) then lrtest (I think- i haven't done it for a while) but you can't > do this with svy. I know you can do something with a wald test- but I don't > fully understand how to interpret that. Anyone have any suggestions? I need > a goodness of fit test... > > What I have done so far: > checked for interactions- found then added to the model. > checked for collinearity- found, centered vars and re ran model with > centered vars. > checked for outliers- (plotted pearson resid's) but I couldn't estimate > deviance residuals (because of svy) so I'm not sure if just one plot is > enough? I had only one outlier. > specification error- i did a linktest which gave me this output: > _hat | 1.145419 .274488 4.17 0.000 .607336 > 1.683502 > _hatsq | .0298467 .0544568 0.55 0.584 -.0769059 > .1365993 > which might mean that i don't have a problem with specification error. but I > wanted to do the 'boxtid' to check for non linear relationships, however > this is not supported with pweights... so I just ran the regression without > the svy etstimation and ran the boxtid. I ended up with non linear reasults > coming up, but none of them significant (in the example online they are > significant of course) so I didn't know if this meant they are non linear > but not to an extent that matters? > age | .4471324 .0736975 6.067 Nonlin. dev. 0.241 (P = > 0.624) > p1 | 2.85128 3.722516 0.766 > > Any other suggestions for checking the model is sound? > thanks in advance! > > -- > View this message in context: http://statalist.1588530.n2.nabble.com/checking-model-fit-with-svy-estimation-on-tp6038042p6038042.html > Sent from the Statalist mailing list archive at Nabble.com. > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/